chamber pressures.

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if I'm correct the 50s are green mtn barrels you might ask them

50 caliber, 1:70 twist, 42" long, 1" across the flats, 1137 steel, single point cut rifled, air gauged, stress relieved, octagon black powder muzzle loader barrel blank >>>---> from their web sight
 
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I recall looking at some pressure stats quite a few years ago that showed the smaller the caliber the higher the pressure.
 
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